I need help making a formula, for a party, one pizza cost 5 dollars, and one pizza can feed 2 people but you can only buy one full pizza, and one cake cost 5 dollars and can feed 6 people but can you can only buy one full cake, and every hour everyone gets one shot of vodka and lets say a shot is 2$ and everyone payed 10$ to come to the party, what would the formula be if, h = the number of hours, x = equals the number of people comming and y = the money left or the money missing to make the party? Thanks for helping.